EFFECTS OF SUPPLEMENTATION WITH CREATINE MONOHYDRATE AND BETA-ALANINE, ALONE OR COMBINED, ON REPEATED SPRINT PERFORMANCE AND PHYSIOLOGICAL PARAMETERS IN AMATEUR TEAM AND RACKET SPORT PLAYERS

The purpose of this study was to compare the combined effects of creatine monohydrate (Cr) and beta- alanine (BA) with their isolated use on performance and physiological parameters during repeated sprint sequences (RSS). Forty-four male (n=34) and female (n=10) amateur team- and racket sport players (25.1±3.1 years; 175.2±9.8 cm; 76.0±10.3 kg; 15.2±6.8% body fat) performed ten repetitions of 6-s sprints with departure every 30 s, before and after a 28-day supplementation period with either Cr (n=11, 5 g‧day-1), BA (n=10, 6 g‧day-1), combined Cr and BA (n=12, 5 g‧day-1 of Cr plus 6g‧day-1 of BA) or placebo (11 g‧day-1 of rice flour). Peak (PP) and mean power (MP), performance decrement (%Dec), heart rate (HR), blood lactate concentration (LA) and perceived exertion (RPE) were measured. Analyses of variance (ANOVA) were used to determine the effects of groups (Cr, BA, CrBA, P), sprint number (1 to 10), and time (pre- vs. post-supplementation) on all variables. A significant increase in PP was shown in the post- compared to the pre-supplementation in Cr (+5.2%) and BA (+5.2%) groups only (p<.05), and significant decreases in MP in all groups (3.7% to 6.4%, p<.05), except BA. %Dec was significantly decreased post-supplementation in the Cr group only (17.4%, p<.05). No effects were shown on HR, RPE and LA (p<.05). These results show no additional benefits of the combination of Cr and BA on RSS performance and suggest that longer sprint or total exercise duration might be necessary to observe the benefits of the combined supplementation

The Recovery Umbrella in the World of Elite Sport: Do Not Forget the Coaching and Performance Staff

In the field of sports science, the recovery umbrella is a trending topic, and even more so in the world of elite sports. This is evidenced by the significant increase in scientific publications during the last 10 years as teams look to find a competitive edge. Recovery is recognized to be an integral component to assist athlete preparation in the restoration of physical and psychological function, and subsequently, performance in elite team sports athletes. However, the importance of recovery in team staff members (sports coaches and performance staff) in elite sports appears to be a forgotten element. Given the unrelenting intense nature of daily tasks and responsibilities of team staff members, the elite sports environment can predispose coaches to increased susceptibility to psycho-socio physiological fatigue burden, and negatively affect health, wellbeing, and performance. Therefore, the aim of this opinion was to (1) develop an educational recovery resource for team staff members, (2) identify organizational task-specific fatigue indicators and barriers to recovery and self-care in team staff members, and (3) present recovery implementation strategies to assist team staff members in meeting their organizational functions. It is essential that we do not forget the coaching and performance staff in the recovery process

Inaccuracy of the HR Reserve vs. V˙ O2 Reserve Relationship during Prone Arm-paddling Exercise in Surfboard Riders

Previous studies have demonstrated that during lower-body exercise the percentage of heart rate reserve (%HRR) is equivalent to the percentage of the oxygen consumption reserve (%V˙O(2R)) but not to a percentage of the peak oxygen consumption (%V˙O(2peak)). The current study examined these relationships in trained surfboard riders (surfers) during upper-body exercise. Thirteen well-trained competitive surfers performed a stepwise, incremental, prone arm-paddling exercise test to exhaustion. For each subject, data obtained at the end of each stage (i.e., HR and V˙O(2) values) were expressed as a percentage of HRR, V˙O(2peak), and V˙O(2R) respectively and used to determine the individual %HRR-%V˙O(2peak) and %HRR-%V˙O(2R) relationships. Mean slope and intercept were calculated and compared with the line of identity (slope=1, intercept=0). The %HRR versus %V˙O(2R) regression mean slope (0.88±0.06) and intercept (20.82±4.57) were significantly different (p<0.05) from 1 and 0, respectively. Similarly, the regression of %HRR versus %V˙O(2peak) resulted in a line that differed in the slope (p<0.05) but not in the intercept (p=0.94) from the line of identity. Predicted values of %HRR were significantly higher (p<0.05) from indicated values of %V˙O(2R) for all the intensities ranging from 35% to 95% V˙O(2R). Unlike results found for lower-body exercise, a given %HRR during prone upper-body exercise was not equivalent to its corresponding %V˙O(2R). Thus, to ensure more targeted exercise intensity during arm-paddling exercise, individual HR-V˙O(2) equations should be used

Activity patterns, blood lactate concentrations and ratings of perceived exertion during a professional singles tennis tournament

The objective of this article is to examine the game characteristics and physiological (ie, blood lactate concentration) and perceptual (ie, rating of perceived exertion, RPE) responses during actual tennis competition in professional performers

Upper body aerobic fitness comparison between two groups of competitive surfboard riders

The aim of the present study was to evaluate and compare the upper-body aerobic fitness characteristics in 2 groups of competitive surfers with different performance levels. Thirteen male competitive surfers performed an incremental dry-land board paddling test to determine specific peak oxygen uptake (V̇O2peak), peak power output (Wpeak) and the exercise intensity (%V̇O2peak) that elicits a blood lactate concentration of 4 mmol·L−1 (LT4). As a measure of surfing performance, surfers were ranked according to their competitive season performance (RANK) and divided into 2 groups based on their performance level; European top-level competitive surfers (ELS) (n=7) and regional level competitive surfers (RLS) (n=6). ELS reached significantly higher values than RLS for Wpeak (154.71±36.82 W vs. 117.70±27.14 W; P=0.04) and LT4 (95.18±3.42 %V̇O2peak vs. 88.89±5.01 %V̇O2peak; P=0.02) but not V̇O2peak (3.34±0.31 L·min−1 vs. 3.40±0.37 L·min−1; P= 0.77). Spearman rank order correlation analysis revealed that RANK was inversely correlated with Wpeak (r= −0.65, P= 0.01) and LT4 (r= −0.58, P= 0.03). These findings identify that better surfers have higher upper body aerobic fitness scores

Post-exercise recovery methods focus on young soccer players. A systematic review

In soccer, training prescription for youth soccer players should consider the specific demands of competitive match play. Further, it is usual to play several competitive matches with insufficient recovery. To facilitate adequate recovery, it is necessary to understand the type of fatigue induced mechanisms. Besides, young players present a differential physiological and anatomical characteristic inside the maturation process. The purpose of this systematic review was to examine the current recovery methods in youth soccer players to provide a source of support to sport practitioners Methodoloy: A structured search was carried out following the Preferred Reporting Items for Systematic Review and Meta-Analyses (PRISMA) guidelines until July 2- 2019, using the next data bases: WOS, Collaboration Database, Cochrane Library, Evidence Database (PEDro), Evidence Based Medicine (EBM) Search review, EMBASE, National Guidelines and Scopus. There were filters applied to the players? age and soccer. Results: A total of 364 articles were obtained in the initial search. After inclusion and exclusion criteria the final sample was 8 articles focus on recovery in young players. Conclusions/Significance: The combination of cold-water immersion plus active recovery may be effective after match, but only cold-water immersion reduces the perception of general fatigue and leg soreness between matches. The Spa treatment is questionable. Whole-body vibration with a traditional cool-down protocol reduces the perceived muscle pain and seems to hasten the recovery of lower-limb explosive force. The passive recovery is better for subjective fatigue estimation. In contrast, the estatic streching is not a beneficial recovery option for elite youth soccer players

Strategies and Solutions for Team Sports Athletes in Isolation due to COVID-19

In December of 2019, there was an outbreak of a severe acute respiratory syndrome caused by the Coronavirus 2 (SARS-CoV-2 or COVID-19) in China. The virus rapidly spread into the whole World causing an unprecedented pandemic and forcing governments to impose a global quarantine, entering an extreme unknown situation. The organizational consequences of quarantine/isolation are: absence of organized training and competition, lack of communication among athletes and coaches, inability to move freely, lack of adequate sunlight exposure, inappropriate training conditions. Based on the current scientific, we strongly recommend encouraging the athlete to reset their mindset to understand quarantine as an opportunity for development, organizing appropriate guidance, educating and encourage athletes to apply appropriate preventive behavior and hygiene measures to promote immunity and ensuring good living isolation conditions. The athlete’s living space should be equipped with cardio and resistance training equipment (portable bicycle or rowing ergometer). Some forms of body mass resistance circuit-based training could promote aerobic adaptation. Sports skills training should be organized based on the athlete’s needs. Personalized conditioning training should be carried out with emphasis on neuromuscular performance. Athletes should also be educated about nutrition (Vitamin D and proteins) and hydration. Strategies should be developed to control body composition. Mental fatigue should be anticipated and mental controlled. Adequate methods of recovery should be provided. Daily monitoring should be established. This is an ideal situation in which to rethink personal life, understanding the situation, that can be promoted in these difficult times that affect practically the whole world